Find the last 4 digits (ZIP+4) for an address in 20830

ZIP 20830, Olney, MD is filled in. Just type the street address.

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ZIP Code 20830 – Olney, MD

Olney, Maryland · Montgomery County · Eastern time

ZIP code20830
CityOlney
StateMaryland
CountyMontgomery County
PopulationNot published (no Census ZIP area)
Time zoneEastern · local time
ZIP typePO box or unique ZIP (no Census area)
Center (lat, long)39.1552, -77.0667

Area codes in this area

227240301

These are the area codes that most often serve ZIP 20830 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

20832 Olney · 0.7 mi20860 Sandy Spring · 1.7 mi20862 Brinklow · 3.2 mi20861 Ashton · 3.6 mi20855 Derwood · 3.7 mi20833 Brookeville · 3.8 mi20853 Rockville · 4 mi20906 Silver Spring · 4.7 mi

About ZIP 20830

ZIP code 20830 is assigned to Olney, Maryland. It lies in Montgomery County. It is a PO-box-only or single-address ZIP, so the Census Bureau does not publish an area for it; the location shown is approximate. The closest neighboring ZIP is 20832 (Olney), about 0.7 miles away.

Every address in 20830 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources